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NET INCOME (LOSS) PER SHARE | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | NET INCOME (LOSS) PER SHARE Potential common shares are excluded from the diluted net income (loss) per share computation to the extent that they would be antidilutive. Because the Company reported a net loss for the years ended December 31, 2018, 2017 and 2016, no potentially dilutive securities have been included in the computation of diluted net loss per share for those periods. As discussed in Note 9, Debt, the Company has the option to pay cash for the aggregate principal amount due upon the conversion of its 2022 Notes. Since it is the Company’s intent to settle the principal amount of its 2022 Notes in cash, the potentially dilutive effect of such notes on net income (loss) per share is computed under the treasury stock method. In 2018, because it was the Company’s intent to settle the conversion premium of its 2019 Notes in cash (as it did upon maturity on February 1, 2019), there was no potentially dilutive effect on the computation of diluted securities. The following table sets forth the computation of basic and diluted net income (loss) per share for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net loss | $ | (471 | ) |  | $ | (42,611 | ) |  | $ | (37,949 | )
Denominator: |  |  |  |  |
Weighted average shares of common stock outstanding | 40,911 |  |  | 39,806 |  |  | 37,236 |
Net loss per share: |  |  |  |  |
Basic and diluted net loss per common share | $ | (0.01 | ) |  | $ | (1.07 | ) |  | $ | (1.02 | )
The following outstanding stock options, RSUs, conversion premiums on the Company’s convertible senior notes, warrants and ESPP purchase options are antidilutive in the periods presented (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Weighted average number of stock options | 5,492 |  |  | 5,171 |  |  | 4,482 |
Weighted average number of RSUs | 542 |  |  | 449 |  |  | 290 |
Conversion premium on the 2019 Notes | — |  |  | 411 |  |  | 2,022 |
Weighted average number of warrants | — |  |  | — |  |  | 1 |
Weighted average ESPP purchase options | 31 |  |  | 29 |  |  | 21 |
Total | 6,065 |  |  | 6,060 |  |  | 6,816 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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